Woofer: 10“ Impedance: 4 Ω Cone: Paper Amplifier Output Power: 300 W MAX Amplifier Output Power: 150 W RMS Lowpass: 60 – 180 Hz Phase shift: 0° / 180° T.H.D: 0.09% S/N (A): 90 dB Operating voltage: 10V – 15V Dimensions: (width x depth x height) Ø 24.4” x 17.32” x 4.72” (5.71” including rubber feet).